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  1. /*
  2.  * H.263i decoder
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "mpegvideo.h"
  22. #include "h263.h"
  23. #include "mpegvideodata.h"
  24.  
  25. /* don't understand why they choose a different header ! */
  26. int ff_intel_h263_decode_picture_header(MpegEncContext *s)
  27. {
  28.     int format;
  29.  
  30.     if (get_bits_left(&s->gb) == 64) { /* special dummy frames */
  31.         return FRAME_SKIPPED;
  32.     }
  33.  
  34.     /* picture header */
  35.     if (get_bits_long(&s->gb, 22) != 0x20) {
  36.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
  37.         return -1;
  38.     }
  39.     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
  40.  
  41.     if (check_marker(&s->gb, "after picture_number") != 1) {
  42.         return -1;      /* marker */
  43.     }
  44.     if (get_bits1(&s->gb) != 0) {
  45.         av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
  46.         return -1;      /* h263 id */
  47.     }
  48.     skip_bits1(&s->gb);         /* split screen off */
  49.     skip_bits1(&s->gb);         /* camera  off */
  50.     skip_bits1(&s->gb);         /* freeze picture release off */
  51.  
  52.     format = get_bits(&s->gb, 3);
  53.     if (format == 0 || format == 6) {
  54.         av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
  55.         return -1;
  56.     }
  57.     s->h263_plus = 0;
  58.  
  59.     s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
  60.  
  61.     s->h263_long_vectors = get_bits1(&s->gb);
  62.  
  63.     if (get_bits1(&s->gb) != 0) {
  64.         av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
  65.         return -1;      /* SAC: off */
  66.     }
  67.     s->obmc= get_bits1(&s->gb);
  68.     s->unrestricted_mv = s->obmc || s->h263_long_vectors;
  69.     s->pb_frame = get_bits1(&s->gb);
  70.  
  71.     if (format < 6) {
  72.         s->width = ff_h263_format[format][0];
  73.         s->height = ff_h263_format[format][1];
  74.         s->avctx->sample_aspect_ratio.num = 12;
  75.         s->avctx->sample_aspect_ratio.den = 11;
  76.     } else {
  77.         format = get_bits(&s->gb, 3);
  78.         if(format == 0 || format == 7){
  79.             av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
  80.             return -1;
  81.         }
  82.         if(get_bits(&s->gb, 2))
  83.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  84.         s->loop_filter = get_bits1(&s->gb) * !s->avctx->lowres;
  85.         if(get_bits1(&s->gb))
  86.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  87.         if(get_bits1(&s->gb))
  88.             s->pb_frame = 2;
  89.         if(get_bits(&s->gb, 5))
  90.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  91.         if(get_bits(&s->gb, 5) != 1)
  92.             av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
  93.     }
  94.     if(format == 6){
  95.         int ar = get_bits(&s->gb, 4);
  96.         skip_bits(&s->gb, 9); // display width
  97.         check_marker(&s->gb, "in dimensions");
  98.         skip_bits(&s->gb, 9); // display height
  99.         if(ar == 15){
  100.             s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
  101.             s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
  102.         } else {
  103.             s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
  104.         }
  105.         if (s->avctx->sample_aspect_ratio.num == 0)
  106.             av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n");
  107.     }
  108.  
  109.     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
  110.     skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
  111.  
  112.     if(s->pb_frame){
  113.         skip_bits(&s->gb, 3); //temporal reference for B-frame
  114.         skip_bits(&s->gb, 2); //dbquant
  115.     }
  116.  
  117.     /* PEI */
  118.     if (skip_1stop_8data_bits(&s->gb) < 0)
  119.         return AVERROR_INVALIDDATA;
  120.     s->f_code = 1;
  121.  
  122.     s->y_dc_scale_table=
  123.     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
  124.  
  125.     ff_h263_show_pict_info(s);
  126.  
  127.     return 0;
  128. }
  129.  
  130. AVCodec ff_h263i_decoder = {
  131.     .name           = "h263i",
  132.     .long_name      = NULL_IF_CONFIG_SMALL("Intel H.263"),
  133.     .type           = AVMEDIA_TYPE_VIDEO,
  134.     .id             = AV_CODEC_ID_H263I,
  135.     .priv_data_size = sizeof(MpegEncContext),
  136.     .init           = ff_h263_decode_init,
  137.     .close          = ff_h263_decode_end,
  138.     .decode         = ff_h263_decode_frame,
  139.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
  140.     .pix_fmts       = (const enum AVPixelFormat[]) {
  141.         AV_PIX_FMT_YUV420P,
  142.         AV_PIX_FMT_NONE
  143.     },
  144. };
  145.